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CD22204 Scheda tecnica(PDF) 3 Page - Intersil Corporation

Il numero della parte CD22204
Spiegazioni elettronici  5V Low Power Subscriber DTMF Receiver
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Produttore elettronici  INTERSIL [Intersil Corporation]
Homepage  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

CD22204 Scheda tecnica(HTML) 3 Page - Intersil Corporation

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Functional Block Diagram
System Functions
Analog In
The Analog In pin accepts the analog input. It is internally
biased so that the input signal may be either AC or DC
coupled, as long as it does not exceed the positive supply
voltage. Proper input coupling is illustrated below.
The CD22204 is designed to accept sinusoidal input
waveforms, but will operate satisfactorily with any input that
has the correct fundamental frequency with harmonics that
are at least 20dB below the fundamental.
Crystal Oscillator
The CD22204 contains an on-board inverter with sufficient
gain to provide oscillation when connected to a low cost
television “color-burst” (3.579545MHz) crystal. The crystal
oscillator is enabled by tying XEN high. The crystal is
connected between XIN and XOUT. A 1M
Ω resistor is also
connected between these pins in this mode. ATB is a clock
frequency output. Other CD22204 devices may use the
same frequency reference by tying their ATB pins to the ATB
output of a crystal connected device. XIN and XEN of the
auxiliary devices must then be tied high and low,
respectively. Up to ten devices may be run from a single
crystal connected CD22204 as shown in Figure 2.
÷8
60Hz
REJECT
CLOCK
GENERATOR
CHIP CLOCKS
PRE EMP
POWER REGULATOR
4
8
VDD
VSS
VOLTAGE
REF
697
770
852
941
1209
1336
1477
1633
BAND
SPLIT
FILTERS
ZERO
CROSSING
DETECTORS
BANDPASS
FILTERS
AMPLITUDE
DETECTORS
OUTPUT
DECODER
OUTPUT
REGISTER
TIMING
CIRCUITRY
DATA STROBE
12
2
1
14
13
3
DATA CLEAR
DV
D1
D2
D4
D8
EN
ANALOG
IN
PREPROCESSOR
7
BS1
BS2
10
9
11
6
ATB
XEN
XIN
XOUT
1M
NOTE: Pin numbers are for plastic DIP.
7
VSS
VDD
10pF
>100k
(ON CHIP)
270k
33k
ANALOG
IN
1500pF
OPTIONAL
HIGH FREQUENCY
NOISE FILTER
(fC = 3.9kHz)
AUDIO
INPUT
(+4dBm OR
1.22VRMS
0.01
µF
CD22204E
MAXIMUM)
FIGURE 1. ANALOG IN
CD22204


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